From the New York Times: Phys Ed: Does Exercise Boost Immunity? http://well.blogs.nytimes.com/2009/10/14/phys-ed-does-exercise-boost-immunity/ I thought this part was interesting. If in ME/CFS the immune system is shifted towards TH2, might this explain some of the negative effects of exercise or a GET program on patients? My brain is mush right now. I'd be interested in what others think.